Equine Herpes Myeloencephalopathy (EHM) Updates:

NEW: EHV-1 Quarantine in Alameda County

October 22, 2019: No additional confirmed cases. CDFA continues to monitor the situation.

October 20, 2019: No additional confirmed cases. CDFA conducted an onsite visit to confirm that all exposed horses continue to have temperatures monitored twice daily and enhanced biosecurity measures have been implemented. 

October 19, 2019: An exposed horse on the quarantined Alameda county premises has been confirmed positive for Equine Herpesvirus-1. This 9- year-old gelding displayed neurologic signs and has been moved off site for isolation and veterinary care. The premises has instituted quarantine required biosecurity measures and all exposed horses continue to be temperature monitored twice daily. CDFA staff conducted an epidemiological investigation and confirmed that there is no connection between the positive horses in Alameda county and the horses involved in the Shasta county incident. The positive horses on the Alameda county premises had not left the property in the last 6 months. CDFA continues to monitor the situation.

 

October 18, 2019: CDFA has quarantined sixty-four (64) exposed horses in Alameda County on the index premises of the neurologic horse which tested positive for Equine Herpesvirus-1.  CDFA staff were onsite today and have implemented enhanced biosecurity measures which includes twice daily temperature monitoring. CDFA will continue to monitor the situation.

 

October 17, 2019: A 12-year-old Arabian mare originating from a premise in Alameda County displaying neurological signs has been confirmed positive for Equine Herpesvirus-1. The mare is under veterinary care and has been isolated and quarantined. This horse has no history of travel from its home premises. This case is not related to the Shasta County EHV-1 incident.  CDFA is conducting an investigation to identify exposed horses and will provide updates as the investigation continues.

 

EHV-1 Quarantine in Shasta County

October 22, 2019: No additional cases. CDFA continues to monitor the sitution.

October 20, 2019: No additional cases. CDFA continues to monitor the sitution. 

October 17, 2019: No additional cases. CDFA continues to monitor the sitution. 

October 14, 2019: No additional cases. CDFA continues to monitor the sitution. 

October 9, 2019: A second horse on the quarantined Shasta County premises displaying a fever has been confirmed positive for Equine Herpesvirus -1.  A third horse on a separate Shasta County premises displaying a fever, has been confirmed positive for Equine Herpesvirus-1. This third positive horse traveled in the same trailer as the index positive horse to the event at the Rolling Hills Equestrian Center on September 27-29.  A fourth horse displaying a fever in Sonoma County has tested positive by a private laboratory for Equine Herpesvirus-1. This horse also participated in the event at the Rolling Hills Equestrian Center on September 27-28, 2019.

 

October 7, 2019: No additional cases. CDFA continues to monitor the sitution. 

October 3, 2019: A 20-year-old quarter horse gelding in Shasta county displaying neurologic signs has been confirmed positive for Equine Herpesvirus-1 (EHV-1). The positive horse has been quarantined and isolated. Four exposed horses on the premises are under quarantine with enhanced biosecurity measures including twice daily temperature monitoring. CDFA will continue to monitor the situation.

The positive horse participated at an event at the Rolling Hills Casino Equestrian Center on September 27-29, 2019. The event stabling has been thoroughly cleaned and disinfected. The event sponsoring organization is notifying membership of the potential exposure. CDFA recommends horses which participated in this event should be isolated and monitored with twice daily temperature recording. Any horse displaying clinicals signs or a temperature over 101.5F should be reported to the veterinarian for evaluation and potential nasal swab and blood sampling.